Is there a better way to implement "string contains substring" in javascript?

Question

I am looking for better options in Javascript to check if a string contains a substring. Substring can either be a text from an input field or database.

Sample:

var substring = "DVI to VGA" //some code to get text from input field or database
var string = "12 DVI To VGA adapter"

if(string.toLowerCase().indexOf(substring.toLowerCase()) != -1){
    //any action after match
    console.log("FOUND A MATCH")
}

Answer 1

I can't think of any, but you can encapsulate what you have in a function that is more concise and reusable:

function stringContainsSubstring(string, substring) {
    return string.toLowerCase().indexOf(substring.toLowerCase()) != -1;
}

Answer 2

var contains = (string.toLowerCase()).includes(substring.toLowerCase());

Answer 3

not exactly a solution, but you can use it like:

if(~string.toLowerCase().indexOf(substring.toLowerCase()){...

looks a bit cleaner